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Behavioural ontogeny of bearded seals Erignathus barbatus through the first year of life

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Author(s)

Charmain D. Hamilton, Christian Lydersen, Mike A. Fedak, Carla Freitas, Mark A. Hindell, Kit M. Kovacs

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Abstract

Pinniped pups face special ontogenetic challenges as they are born and receive maternal care on solid substrates (land or ice) but must transition to feeding aquatically following weaning. In this study, Satellite Relay Data Loggers were used to study behavioural ontogeny of bearded seal Erignathus barbatus pups (n = 13) through their first year in Svalbard, Norway. Pups occupied shallow, coastal habitats and were found in areas with intermediate ice concentrations (in seasons with sea ice - late-autumn/winter). Most pups showed exploratory movement patterns that peaked in the weeks following weaning; maximum home range size occurred at 31 to 60 days of age. Thereafter, home range size decreased with pups settling into areas along the coast. Time spent diving, dive duration, dive depth and time at the bottom of dives increased during the first weeks of independence, stabilizing when pups were ~50 d old. Dive depth subsequently decreased to depths comparable to adult bearded seals (by the time pups were ~175 d old). Record maximum dive depth (368 m) and duration (16.5 min) were performed by pups that were 66 and 224 d old, respectively. Time spent hauled out decreased after weaning, with pups hauling out only sporadically after they were 75 d old. Bearded seals pups seem to be physiologically and behaviourally well developed by the time they are two months old. Pups did not display the individually specialized diving behaviour seen in adults, which suggests that they continue to fine-tune their aquatic and other life-skills well past the end of the first year of life.
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Original languageEnglish
Pages (from-to)179-194
Number of pages16
JournalMarine Ecology Progress Series
Volume627
Early online date18 Jul 2019
DOIs
Publication statusPublished - 26 Sep 2019

    Research areas

  • Diving development, Pinniped development, Phocid seals, Svalbard

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